Immature individuals dominate elasmobranch fisheries of the Bali Strait

Winter, Sara Tabea; Fahmi, Fahmi; Rudianto, Didik; Laglbauer, Betty J.L.; Ender, Isabel; Simpfendorfer, Colin A.

doi:10.1071/mf19300

Cited by 7 publications

(2 citation statements)

References 62 publications

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“…However, these nets can be used to target a variety of other species in addition to tunas, including demersal sharks and rays, Spanish mackerels (Scombridae), catfish ( Arius spp., Ariidae) and seabreams (Sparidae), and can be used interchangeably as a bottom‐set gill nets and drift nets depending on the season and target species (Khan, 2017; Shahid, Khan, Nawaz, Abdul Razzaq, & Ayub, 2016). Vessels also frequently use multiple gears in combination, such as drift gill nets with snoods attached along the lead line or nets hung between pelagic longlines, which further complicates estimates of fishing effort (Henderson, McIlwain, Al‐Oufi, & Al‐Sheili, 2007; Jabado & Spaet, 2017; Winter, Rudianto, Laglbauer, Ender, & Simpfendorfer, 2020; Yulianto et al, 2018). We attempted to capture the boats more likely using drift gill nets by selecting only powered vessels for the gear types longlines, purse seines and gill nets, and two target catch categories (pelagics 30–90 cm length and pelagics larger than 90 cm).…”

Section: Methodsmentioning

confidence: 99%

Spatially explicit risk assessment of marine megafauna vulnerability to Indian Ocean tuna fisheries

et al. 2022

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By‐catch is the most significant direct threat marine megafauna face at the global scale. However, the magnitude and spatial patterns of megafauna by‐catch are still poorly understood, especially in regions with very limited monitoring and expanding fisheries. The Indian Ocean is a globally important region for megafauna biodiversity and for tuna fisheries, but has limited by‐catch data. Anecdotal and scattered information indicates high by‐catch could be a major threat. Here, we adapt a Productivity Susceptibility Analysis tool designed for data‐poor contexts to present the first spatially explicit estimates of by‐catch risk of sea turtles, elasmobranchs, and cetaceans in the three major tuna fishing gears (purse seines, longlines, and drift gill nets). Our assessment highlights a potential opportunity for multi‐taxa conservation benefits by concentrating management efforts in particular coastal regions. Most coastal waters in the northern Indian Ocean, including countries that have had a minimal engagement with regional management bodies, stand out as high risk for fisheries interactions. In addition to species known to occur in tuna gears, we find high vulnerability to multiple gear types for many poorly known elasmobranchs that do not fall under any existing conservation and management measures. Our results indicate that current by‐catch mitigation measures, which focus on safe‐release practices, are unlikely to adequately reduce the substantial cumulative fishing impacts on vulnerable species. Preventative solutions that reduce interactions with non‐target species (such as closed areas or seasons, or modifications to gear and fishing tactics) are crucial for alleviating risks to megafauna from fisheries.

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Section: Methodsmentioning

confidence: 99%

Spatially explicit risk assessment of marine megafauna vulnerability to Indian Ocean tuna fisheries

et al. 2022

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“…In Indonesia, it is rarely seen in fish landing sites and caught mostly by demersal longline and coastal gillnet vessels. In Muncar, East Java Province, tawny nurse shark was recorded as just around 0.1% of the elasmobranch catch landed in 2017-2018 (Winter et al, 2020). In Tanjung Luar, East Lombok, West Nusa Tenggara Province, only 14 specimens between April 2001and March 2006(Dharmadi et al, 2015 and 62 specimens were recorded between 2014 -2020 (Wildlife Conservation Society, 2022).…”

Section: Introductionmentioning

confidence: 99%

Record of Tawny Nurse Shark (<em>Nebrius ferrugineus</em>) in Southern Morotai, North Maluku, Indonesia

Ichsan¹,

Bimantara²,

Pridina³

et al. 2022

Preprint

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Tawny nurse shark (Nebrius ferrugineus) is a species of carpet shark distributed across the tropical Indo-Pacific region. Tawny nurse shark is listed as “Vulnerable” on IUCN Redlist and rarely seen, recorded and studied in Indonesia. We recorded this species during SCUBA diving activity in Morotai waters in April 2022. Scientific record of the species is highly important for conservation and habitat management, particularly in Morotai, a region in North Maluku famous for shark-based marine tourism.

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Tourism, international wildlife trade and the (in)effectiveness of CITES

Chavez,

Payuse,

Kuntayuni

et al. 2023

Envir. Conserv.

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Summary There are clear links between tourism and the international wildlife trade, especially in countries with high levels of biodiversity and high numbers of international tourists. In the absence of clear regulations and implementation of existing policies, tourists can inadvertently have a negative impact on the environment, including through items bought as souvenirs. Bali is one of the world’s premier tourist destinations. We investigated legally protected species that are offered for sale specifically targeting tourists in Bali. During December 2022–June 2023, we surveyed 66 shops offering curios (skulls, bones, carvings) of animals for which the international trade is regulated by the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES). We found items from >500 individuals of 20 CITES-listed species, including primate skulls, ivory carvings and decorated shells. According to vendors, there would be no problem exporting these items despite the absence of CITES permits. Export records over the last two decades provided by the Indonesian authorities, mostly indicating no exports, contrast sharply with our observations in Bali. A short but effective campaign as a collaborative effort between industry, tourism operators, local and expatriate communities and government agencies could result in a drastic reduction of protected and/or CITES-listed species ending up in trade.

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Immature individuals dominate elasmobranch fisheries of the Bali Strait

Cited by 7 publications

References 62 publications

Spatially explicit risk assessment of marine megafauna vulnerability to Indian Ocean tuna fisheries

Spatially explicit risk assessment of marine megafauna vulnerability to Indian Ocean tuna fisheries

Record of Tawny Nurse Shark (<em>Nebrius ferrugineus</em>) in Southern Morotai, North Maluku, Indonesia

Tourism, international wildlife trade and the (in)effectiveness of CITES

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